1. Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences , Beijing, Beijing 100190 , China
2. School of Physics, Hangzhou Normal University , Hangzhou, Zhejiang 311121 , China
3. School of Physical Sciences, University of Chinese Academy of Sciences , Beijing, Beijing 100190 , China
4. Songshan Lake Materials Laboratory , Dongguan, Guangdong 523808, Beijing , China